[PATCH] D128758: [RISCV] Refine known bits for READ_VLENB

[Philip Reames via Phabricator via llvm-commits]

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This implements known bits for READ_VALUE using any information known about minimum and maximum VLEN.  There's an additional assumption that VLEN is a power of two.

The motivation here is mostly to remove the last use of getMinVLen, but while I was here, I decided to also fix the bug for VLEN < 128 and handle max from command line generically too.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128758

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/rvv/rvv-vscale.i64.ll

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